Clavius, Christoph, Gnomonices libri octo, in quibus non solum horologiorum solariu[m], sed aliarum quo[quam] rerum, quae ex gnomonis umbra cognosci possunt, descriptiones geometricè demonstrantur

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208188GNOMONICES11
Aſcen-
\\ dentia. # Deſcen \\ dentia. # In medio \\ cœli. # In angulo \\ terrę. # Aſcen- \\ dentia. # Deſcen \\ dentia. # In medio \\ cœli. # In angulo \\ terræ.
# # G. M. # G. M. # # # G. M. # G. M.
# # o. o. . # o. o. . # # # o. o. . # o. o. .
# # 15. 59. . # 15. 59. . # # # 6. 3. . # 6. 3. .
# # 6. 3. . # 6. 3. . # # # 16. 1. . # 16. 1. .
# # @. 6. . # 5. 6. . # # # 24. 54. . # 24. 54. .
# # 13. 59. . # 13. 59. . # # # 23. 57. . # 23. 57. .
# # 23. 57. . # 23. 57. . # # # 14. 1. . # 14. 1.
IT AQVE quotieſcunq; ex vmbra gnomonis deprehendero v. g. aſcendere principiũ , ſine vlla
mora
intelligam, eodem momento temporis primum punctum , deſcendere, in medio cæli exiſtere gr.
6.
Min. 3. , & in angulo terræ cõſtitui gr. 6. Min. 3. , atq; ita de cæteris. Cognitis autẽ hoc modo quatuor
dictis
punctis principalibus cæli, facile coniectura aſſequi cuiuis licebit, quibuſnam in partibus cæli cæte-
ra
Zodiaci ſigna tunc poſita ſint, atq;
adeo ſi ſtellarum loca cognita fuerint in Zodiaco, vna cum earum
declinatione
, vel latitudine, quænam ſtellæ in hac, vel in illa parte cæli exiſtant, etiamſi non cõpareant.
2220
CAETERVM quoniam ſex tantum ſigna in die artificiali quocunq; oriuntur, fit vt ſex duntaxat
33Quolibet die
obſeruanda
eſt,
vmbra
gnomo-
nis
in ſex dun-
taxat
lineis il-
lorum
ſex ſigno
rum
, quæ illo
die
oriuntur ſu
pra
Horizontẽ.
lineæ ſignorum aſcendentium quolibet die propoſito monſtrent aſcendentia ſigna, lineæ nimirum illorum
ſex
ſignorum, quæ inter diu oriuntur, quæ quidem computantur à loco Solis ſecundum ſucceſſionem ſigno-
rum
:
quia Ecliptica ſolum illas poſitiones ſortitur eo die, quas lineæ illæ referunt, reliqua ſigna inter-
diu
tunc non oriantur.
Vnde licet vmbra ſtyli cadat in lineam alicuius ſigni, quod non continetur inter
147[Figure 147] ſex ſigna illo die orientia, non
tamen
propterea illud tunc a-
ſcendere
arbitrandum eſt, cum
nectota
illa die poſſit oriri, nec
Ecliptica
illum ſitum habere,
4430 quem linea illa exprimit.
Exem
plum
.
Sole exiſtente in princi-
pio
, oriuntur interdiu hæc
tantum
ſex ſigna , , ,
, , &
, occidente ver@
Sole
oritur principium .
Q@@
re
tunc non aſcendent interdiu
ſupra
Horizontem hæc ſex ſi-
gna
, , , , , , &
,
quamuis
vmbra gnomonis in il-
5540 lorum lineas cadat.
Eadem ra
tione
Sole exiſtente circa me-
dium
, oriuntur in die hæc
dũtaxat
ſex ſigna, reliqua pars
, , , , , , &
tan-
ta
portio , quãtam in , pro-
prio
motu Sol per ambulauit;
vt ſi Sol exiſtat in 18. grad. ,
orientur
gr.
18. . Reliqua ve
ro
ſex ſigna, nẽpe reliqui 12.
gr.
6650 , , , , , , &
gr. 18.
, qui ante Solẽiam orti ſunt,
ſupra
Horizontẽ illo die non e-
mergent
;
& ſic de cæteris. Quo-
libet
ergo die propoſito, vt in-
telligamus
, quænam ſigna exo-
riantur
, &
quæ non, ac proin-
de
quaſnam lineas aſcerden-
tium
ſignorum tunc obſeruare debeamus, inquirendum erit prius, vbi Sol verſetur in Zodiaco.
Nam
toto
illo die obſeruanda ſolum erit vmbra ſtyli cadens in lineas ſex ſignorum, quæ oriri poſſunt ſu-
pra
Horizontem.
Immo contingere ſolet, vt in eadem die bis vmbra ſtyli in eandem cadat lineam:

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